In contact sports when a player is hit, checked or tackled by an opponent so hard the equipment from the player being hit fall off the player and spread all over the playing surface. Make the playing surface look like the front yard at a Garage or yard sale covered in used sporting equipment. The opposition will then yell "Yardsale" to complete the act.

"Did you see me yardsale that guy last quarter. His helmet landed 10 yards away."

When a girl is giving a guy head and jerking two guys off at once. Dervied from a skiing term, because a face plant during alpine skiing is called a yardsale. So when the girl is skiing (jerking two guys off at once) and falls down on the third guy's cock, its called a yardsale.

That gang bang really got crazy last night when we yard saled that bitch.